Improvement in tube-cutters



DANIEL @anni dawn,

n. EATON, or Bosrouassrenon Tio niMsELr AND .Janus s.

Letters Patent No. 111,442, dated January 31, 1871.

IMPROVEMENT IN TUBE'CUTTERS.

The4 Schedule referred to in these Letters Patent and making part of the same.'

To all whom it may conce/rn:

Be it known that I, DANIEL'E. EATON, of Boston, in the county of Sudolk and State of Massachusetts, have invented ern-Improved Tube-Cutter; and I do hereby declare that the following, taken in connectionl with the drawing-which accompanies and forms part of this specification, is a description of my invention sufcient to enable those skilled in the art to practice it. i

My invention relates to the construction. of a tool designed for cutting offthc projecting ends of steam- .boiler tubes, and to such anarrangement ,of parts as shall render automatic a progressive outward movement of the cutters, to cause them to cut into and through thc metal as the cutter-stock is rotated, the tool being of that class in which the cutters work from the inside of the tube and are expanded or forced outward as the cutting progresses.

My invention consists, primarily, in hanging the cutters in vertical cutter-stocks, which rest at their inner surfaces against incline faces on the sides of a center-rod, so that upward movement of the cutterstocks causes theml to be forced outward by the inclines, the cutter-stocks being hung to a nut-threaded collar or head, through which works a screw, so that rotation ofthe head and cutter-stocks, and the center-rod and its inclines in one direction, causes the rod and its inclines to be fed down upon the screw, the inclines thereby forcing the cutters outward, they acting only in one plane, at right angles to the axis of the tube.

The drawing represents a tube-cuttiu g tool embody-l ing my invent-ion.

A showsthe tool in elevation.

G is a cross-section on the line x x.

y a denotes the centr. l-rod, having at one end a disk .or roll, b, by which it is centered in the tube, and at the opposite end a head, c, formed to be grasped by a suitable wrench Yor lever-handle.

In the sides of an enlarged part d of the rodfare recesses e, each increasing in depth from top to bottomso that the inner walls or surfaces form inclines f.

In 'each of these recesses lies a cutter-stock, g, e'ach stock havinga suitable cutter, which may be a rotary disk-cutter, h, or a bit, i, so made as to displace the metal against which it acts, or to remove it in chips, as may be preferred.

rl'he inner face oi-faees of each of these stocks rests vagainst the adjacent incline, as seen at B and C,

and each is preferably hung by a link, 7e', to ears or projections l,on the 'under side of a head, collar, or nut, m, through thenut-thread not which passes a tubular feed-screw, o, the end of thc rod a passing through the tube, as vseen at B.

By turning the'screw o relatively to the rod, toolstock, and head, or'e'icc versa., the screw acts against the'surface 11 of the rod, and the tool-stocks are fed over-'the incliues, and as the stocks slide up the inclines, the cutters are thrown outward radially, so that, as the cutters, by their rotation, cut into the inner surface of the tube, they are fed outward as fast as they cut, the pitch ofthescrew-thread being such that the cutters are only fed outward in accordance with their cutting power To gauge the distance from the cud of a tube at which thc cutters shall vact, from the tubeshcet through which the tubes extend, I employ a device as follows:

The collar or tool-stock head m is formed with lips q, which lap over a ring, r, provided with radial arms s, in which arms, are fixed pins At, 'which are preferably slide-pins, held iu place by screws en Before the rod a is inserted in the tube to he cui, the pins are set so that their inner ends are in a plane, as far from the 'plane of the cutters as lthe distanceto which the tube-ends are to be Yleft projecting, and the screws a are tightened, thereby fastening .the pins in place, the cutters being then in a plane, at such distance from the tube-sheet as will leave the tube, when cnt oil', projecting just far enough to he turned `over or expanded upon and fastened to the tube-sheet, and it will be obvious that whether any tube projects more or less, all will be thus trimmed so as to project to a uniform distance from the end of the tube-sheet.

To keep thefeed-screw o from rotation'whilc the cutters are rotating, a pin, o, is inserted in some one of a series of holes, w, made in a head, a, of the screw, this pin striking the irst piu t, and remaining stationary against said pin, thereby locking the screw against rotative movement.

'Ihe tool thus organized, is very easily, worked by a suitable wrench or lever applied to the outer end of the rod a, requires no skill in the workman to operate it, and cuts awayonly the metal necessary to effect the removal of the project-ing tube ends.

I yclaiml. The rod a, with its incliues f, the cutter-stocks jointed to the nut or collar ou, and the feed-screw o, combined and operating substantially as shown and described.

42. In combination with the cutters arranged to operate as described, the ring lr, and gauge-pins -substantially as shown and described.

r'Executed November 11, A. I). 1870.

' `D. E. EATON.

)Witnesses FRANCIS GoULn, M. W. Fnornnvonnar. 

